good first issuehtmltype:bug
Description
Hi, I was looking at the spec https://html.spec.whatwg.org/multipage/scripting.html#selector-read-only and the readwrite-readonly tests and I think I found a bug in https://github.com/w3c/web-platform-tests/blob/master/html/semantics/selectors/pseudo-classes/readwrite-readonly.html#L54. As I understand, :read-only is defined as not(:read-write), which means that the expected result is not correct. Am I missing something?